Vq35de Rev Up Engine For Sale

Alright, let's talk about the VQ35DE "Rev Up" engine. You've probably stumbled across listings for them, maybe even considering one for your project. Before you jump in, it's crucial to understand what makes the Rev Up different from other VQ35DE variants, what its strengths and weaknesses are, and what to look for when buying one second-hand. Think of this as your pre-purchase inspection checklist, but for the engine itself.

What is the VQ35DE Rev Up?

The VQ35DE is a 3.5-liter, naturally aspirated V6 engine produced by Nissan. It's a staple in many of their vehicles, from the Altima to the 350Z. The "Rev Up" version, specifically, was used primarily in the 2005-2007 350Z (manual transmission models) and the 2005-2006 Infiniti G35 (manual transmission models). It's called the "Rev Up" for a reason: it boasts a slightly higher redline and a tweaked power curve compared to the standard VQ35DE. Expect to see horsepower figures around 300hp at the crank. This improvement came from a few key changes to the engine's internals and tuning.

Key Differences from the Standard VQ35DE:

Here's a breakdown of the significant differences that define the Rev Up:

Continuous Variable Valve Timing Control System (CVTCS) on the Intake and Exhaust Cams: This is the big one. The standard VQ35DE only has CVTCS on the intake cams. Adding it to the exhaust side allows for finer control over valve timing, optimizing airflow and increasing horsepower, especially at higher RPMs. This is the primary driver behind the "Rev Up" name.
Revised ECU Tuning: To take advantage of the dual CVTCS, the ECU (Engine Control Unit) mapping is different. This allows the engine to breathe more efficiently and deliver that extra power.
Slightly Higher Redline: The redline is bumped up a few hundred RPM compared to the base VQ35DE. It's not a huge jump, but it contributes to the overall feeling of a more responsive engine.
Different Connecting Rods: While visually similar, the connecting rods in the Rev Up engine are slightly different to cope with the higher RPM and power output.

Why Buy a Rev Up VQ35DE?

There are a few compelling reasons why you might consider a Rev Up VQ35DE for your project:

Increased Power Potential (Naturally Aspirated): If you're sticking with a naturally aspirated setup, the Rev Up offers a readily available bump in horsepower compared to the standard VQ35DE.
Dual CVTCS Advantage: The dual CVTCS provides greater flexibility for tuning and maximizing performance, especially if you plan on making further modifications.
Availability and Cost: Compared to some newer or more specialized engines, the VQ35DE Rev Up is relatively common and can be found at a reasonable price (depending on condition, of course).
Aftermarket Support: The VQ35DE platform, in general, has excellent aftermarket support. This means plenty of options for performance parts, tuning solutions, and replacement components.

Things to Watch Out For: Common Problems

Like any engine, the VQ35DE Rev Up has its share of potential issues. Knowing these beforehand can save you a lot of headaches (and money) down the road:

Oil Consumption: This is a well-known issue with the VQ35DE, and the Rev Up is no exception. Keep an eye out for excessive oil consumption, especially at higher RPMs. This can be caused by worn piston rings or valve stem seals. Look for signs of blue smoke from the exhaust, which is a telltale sign of burning oil. A compression test and leak-down test are crucial to assess the condition of the piston rings and valves.
Timing Chain Issues: The timing chain tensioners can wear out over time, leading to timing chain slack. This can cause engine noise, reduced performance, and potentially catastrophic engine damage. Listen for a rattling noise, especially on startup, which could indicate a worn timing chain or tensioner.
Camshaft Position Sensors (CPS): Faulty CPS sensors are common. Symptoms include rough idling, poor acceleration, and a check engine light. Diagnosing this requires a scan tool to read the trouble codes.
Coolant Leaks: Inspect all coolant hoses and connections for leaks. The VQ35DE is known for developing leaks around the thermostat housing and water pump.
Knock Sensor Issues: Knock sensors detect engine knock or detonation. If they fail, the ECU may retard timing, reducing performance and fuel economy. They can be difficult to access, so replacing them often involves removing the intake manifold.
Valve Cover Gaskets: Check for oil leaks around the valve covers. The valve cover gaskets can become brittle and leak over time.

What to Look for When Buying a Used VQ35DE Rev Up: A Checklist

Okay, you're ready to start shopping. Here's a detailed checklist to help you evaluate the condition of a used Rev Up VQ35DE:

Visual Inspection:

Overall Condition: Is the engine clean and well-maintained? A clean engine is often a sign that the previous owner cared for it.
Leaks: Check for oil leaks around the valve covers, oil pan, front and rear main seals, and coolant leaks around the water pump and thermostat housing.
Wiring Harness: Inspect the wiring harness for any signs of damage, cuts, or repairs. Make sure all connectors are intact and secure.
Intake Manifold: Check for cracks or damage to the intake manifold. Ensure all vacuum lines are connected properly.
Exhaust Manifolds: Inspect the exhaust manifolds for cracks or leaks. Check the condition of the exhaust manifold studs and nuts.
Oil Pan: Look for dents or damage to the oil pan. This could indicate that the engine has been subjected to rough handling.

Operational Checks (if possible):

Starting: Does the engine start easily and quickly? A slow or difficult start could indicate issues with the starter, battery, or compression.
Idle: Does the engine idle smoothly and consistently? A rough or erratic idle could indicate vacuum leaks, faulty sensors, or other issues.
Engine Noise: Listen carefully for any unusual noises, such as knocking, rattling, or ticking. Pay particular attention to noises that might indicate timing chain issues or rod knock. Use a mechanic's stethoscope for a more precise assessment.
Smoke: Observe the exhaust for any signs of smoke. Blue smoke indicates burning oil, black smoke indicates excessive fuel, and white smoke could indicate a coolant leak.
Oil Pressure: If possible, check the oil pressure. Low oil pressure could indicate worn bearings or a faulty oil pump.
Coolant Condition: Inspect the coolant for any signs of contamination, such as oil or rust.

Essential Tests:

Compression Test: This is a must. A compression test measures the pressure in each cylinder, providing valuable information about the condition of the piston rings and valves. Low or uneven compression indicates wear or damage. Record the values for each cylinder; they should be within 10% of each other.
Leak-Down Test: A leak-down test is even more revealing than a compression test. It measures how much air leaks out of each cylinder when it's pressurized. This helps pinpoint the source of compression loss (e.g., rings, valves, head gasket).
Oil Analysis: If possible, obtain a sample of the engine oil and send it to a lab for analysis. This can reveal the presence of wear metals, coolant, or fuel in the oil, providing valuable insights into the engine's internal condition.
Check Engine Codes: Use an OBD-II scanner to check for any stored trouble codes. Even if the check engine light isn't on, there may be pending codes that indicate potential problems.

Don't Forget the Paperwork!

Finally, don't just focus on the engine itself. Ask the seller for any available documentation, such as maintenance records, receipts, or warranty information. This can provide valuable insights into the engine's history and condition. A reputable seller should be able to provide this information without hesitation.

Making the Decision

Buying a used engine is always a risk, but by following this guide, you can significantly reduce your chances of ending up with a lemon. Remember to take your time, do your research, and don't be afraid to walk away if something doesn't feel right. Good luck with your project!